Synthesis of nanocrystals in KNb(Ge,Si)O5 glasses and chemical etching of nanocrystallized glass fibers

Itaru Enomoto, Yasuhiko Benino, Takumi Fujiwara, Takayuki Komatsu

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


The nanocrystallization behavior of 25K2O-25Nb2O5-(50-x)GeO2-xSiO2 glasses with x = 0, 25, and 50 (i.e., KNb(Ge,Si)O5 glasses) and the chemical etching behavior of transparent nanocrystallized glass fibers have been examined. All glasses show nanocrystallization, and the degree of transparency of the glasses studied depends on the heat treatment temperature. Transparent nanocrystallized glasses can be obtained if the glasses are heat treated at the first crystallization peak temperature. Transparent nanocrystallized glass fibers with a diameter of about 100 μm in 25K2O-25Nb2O5-50GeO2 are fabricated, and fibers with sharpened tips (e.g., the taper length is about 450 μm and the tip angle is about 12°) are obtained using a meniscus chemical etching method, in which etching solutions of 10 wt%-HF/hexane and 10 M-NaOH/hexane are used. Although the tip (aperture size) has not a nanoscaled size, the present study suggests that KNb(Ge,Si)O5 nanocrystallized glass fibers have a potential for new near-field optical fiber probes with high refractive indices of around n = 1.8 and high dielectric constants of around ε = 58 (1 kHz, room temperature).

Original languageEnglish
Pages (from-to)1821-1829
Number of pages9
JournalJournal of Solid State Chemistry
Issue number6
Publication statusPublished - Jun 2006
Externally publishedYes


  • Chemical etching
  • Fiber probes
  • Glass fiber
  • Nanocrystallization
  • Raman scattering spectra

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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